MIL-DTL-38999 Series I connectors, designed for harsh environments, feature up to 128 contacts in an insert and offer front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. These connectors, with an operating temperature range of -65 °C to 200 °C, are ideal for demanding applications. They come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they are available in different plating options, including cadmium-free finishes, ensuring durability and reliability. The connectors, with a bayonet coupling design, are suitable for military and industrial use, meeting MIL-DTL-38999 standards for performance and quality.